Depends on the situation. Usually I just stick to the pipe, especially in situations where me and my friends cant easily hide our smoking device.
If we're just relaxin somewhere, the bong or a bubbler is great.
If I have access to the supplies to make a vaporizer or if I'm with someone who has a vaporizer, thats the way to go. It's clean, safe, doesnt smell as much and it gives such a clearheaded high. Plus the weed lasts sooo much longer.
Joints and blunts are nice from time to time but I often dont have enough weed to spare. Plus it wastes weed since it doesnt stop burning. If I had the bud to spare I'd probably smoke joints more often.